And augustus



(No Model.) 3 SheetsSheet 1. G. M. NEWHALL & A. W. OOLWELL.

BONE BLAGK DRIER.

ented May 11, 1886.

VEA/TORS. z: mum

N, PETERS. PhuXwLdlwgv-nphcr. Wnshlngln. u. c.

(No Model.) a Sheets-Sheet 2. G. M. NEWHALL 8a A. W. GOLWELL.

INVE/VTURS. W WLMQJL y i d' Arrow/H4.

BONE BLAGKIDRIBR.

N0. 341,49 May 11, 1886.

'w/r/vgsszs;

LIP

N. PETERS. Phuln-Lilhagraphcr, Wzuhmglon. I1. I;

(No Model.) 3 ShetsSheet 3.

G. M. NEWHALL & A,- W. OOLWELL. BONE BLACK DRIER.

No. 341,497. Patented May l1, 1886.

Jay-3.

WITNESSES: I m fi m 2/ I By w m 52.2

' ATTOR/VL-Yd.

N. PFIERS, PMXo-Lilhngraphor, Wmhinglou D c 50 but open at the bottom.

UNITED STATES PATENT OFFICE.

GEORGE M. NEVVHALL, OF PHILADELPHIA, PENNSYLVANIA, AND AUGUSTUS NV. COLVELL, OF NE\V YORK, N. Y.

BONE-BLACK DRIER.

GPEZCIFICATION forming part of Letters Patent No. 341,497, dated May 11, 1886.

Application filed March 9, 1886. Serial No. 198,534. (No model.)

To all whom it may concern:

Be it known that we, GEORGE M. NEWHALL, of the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, and

AUeUsrus W. CoLwnLL, of the city of New York, in the county and State of New York, have invented an Improved Bone-Black Drier, of which the following is a complete specifieation, reference being had to the accompanying 1o drawings, in which Figure l is a front elevation, partly in section, of our improved bone-black drier. Fig. 2 is a vertical longitudinal section of the same; Fig. 3, a plan or top View, on a reduced scale,

of a series of the driers united into one system.

This invention has for its object to prevent unnecessary loss of heat from the firing of the kilns for revivifying charcoal or analogous substances and permit the utilization of such heat (which at present is allowed to escape) for the purpose of assisting in drying the contents of the drier.

The invention consists in surrounding the 2 5 cooler-pipes of a kiln of this character with an apron,whicl1 confines the radiating heat from such pipes,and which forms in effect the.

hot-air chamber from which the heat may be carried to other places to be utilized.

The invention also consists in connecting the hot-air space thus formed by a suitable channel with a chamber in which the charcoal is preliminarily dried.

It also consists in other details of improve- 3 5 ment, that are hereinafter more fully specified.

In the drawings, the letter A represents the preliminary drier,which is shown as of a kind described in Letters Patent No. 158,166, of December 29,, 1874; but it may be of any other 40 kind. B is the kiln; O, the fire-door; D, the

ash-pit; E, the cooler-pipes; F, the lower hopper. All these parts are of the well-known construction, except in the particular details here-v inafter stated.

The first part of our invention consists in placing an apron, G, beneath the kiln B and around the cooler-pipes. This apron extends downward, say, six feet, more or less, forming a hotair chamber, which is closed on top This hot-air chamher, so formed by the apron G, relieves and stores the heat radiating from the pipes E, to be utililized, as hereinafter stated.

From the apron G extends the air-duct H to the side of the drier A, for the purpose of conveying the heated air into the spaces that are formed in the drier between the layers of material to be dried. The heated air passes from the duct 11 by pipes a into said drier. A sieve, I), is placed over the pipes a to equalize the distribution of heated air that goes from the duct into the drier. From this drier the heated air escapes into a pipe, I, in which there is a suction-fan at J and a damper at d. The suction-fan,wl1en used in connection with the damper d,will draw as much of the heated air as necessary from the apron-chamber G into and through the drier A, so that the said heated air will assist in drying the char. The heated air drawn by the fan J from the drier is charged with moisture from the contents of the-drier, and is finally propelled by the fan J through the pipe L into the ash'pit D, there to assist in producing more perfect combustion.

In many instances it will not be necessary or desirable to draw all the heated air through the drier A, and yet it will be desirable to withdraw the heated air from the apron-chamher and convey it into the ash-pit. To enable this to be done, we connect the duct H by a separate pipe, M,which does not lead through the drier, with the pipe I, that leads to the damper J, and into this pipe M we place the damper 0. By properly adjusting the dampers d c we are now enabled to draw part of the air through the drier and part of the air past the drier, and yet to convey all the air into the ash-pit.

Instead of putting the fan J between the pipes I and L, as shown, itmay be placed in the duct H, as shown by dotted lines in Fig.

2. The effect will be the same.

In order to prevent the duct H from taking the heated air from only that part of the apronchamber G which is nearest the duct, we unite the lower end of said duct with a series of pipes, f g h, each of which communicates with said duct, and all of which are of different lengths, so that the longest, h, will lead to the farthest portion of the apron-chamber, and the shortest, f, to the nearest portion thereof.

Each of these pipes fg It should also have a damper, as atf If, so that by means of these dampers we can regulate the air taken from each part of the apron-chamber.

Should any part of the heated air which is confined in the apron-chamber be desired for the purpose of heating the building in which the apparatus is erected, such air may be drawn from the upper part of the apron-chamber through a damper or door, 1', which is placed in the upper part of said apron-chamher; or there may be more than one such damper or door *5, for the purpose stated.

WVe have stated that the air is drawn from the apron-chamber to and through the drier by means of a fan or fans; but fans are not always needed, and useful results will be reached by the employment merely of the natural draft, which will cause the heated air to rise from the apron-chamber and to ascend through the duct H into the drier.

Inasmuch as kilns of the kind referrrd to are frequently used in series, it will not be necessary when fans are employed to have one for each kiln; but one fan will answer for the series. Thus, in Fig. 3, in which three kilns are represented, the driers are connected by their pipes I I with a pipe, 1 which leads to the fan J. This fan discharges the air into the pipe L, from which the pipes L L lead into the ash-pits of the several kilns.

So far as the drier itself is concerned we have improved upon the construction shown in Letters Patent N 0. 158,166, by applying to the walls of said drier inclined shelves m m, which are in line with the shorter series of smoke-fines, a n, that pass through said drier, and which furnish additional heated airpassages beneath them that otherwise would be choked by solid masses of char. By this means we increase the drying capacity of the appa ratus.

1. The combination of the kiln B and its dowmvardly-projecting cooler-pipes E with the apron G, surrounding the cooler-pipes and forming the hot-air chamber, which is open at the bottom, but closed at the top, substantially as described. I

2. The combination of the drier A, kiln B, coolers E, and apron G, around said coolers, with the hot-air duct H, sieve b, and drier A, substantially as described.

3. The combination of the drier A, kiln B, coolers E, and apron G with the hot-air duct H and air-propelling fan J, substantially as described.

4. The combination of the drier A, kiln B, coolers E, apron G, hot-air duct H, leading to the drier, fan J, and pipe L, leading from said fan to the ash-pit of the kiln, as specified.

5. The combination of the drier A, kiln B, coolers E, and apron G, around said coolers, with the hot-air duct H, leading from the apron to the drier, pipe I, and fan J, with the pipe M, leading from the duct H to the pipe I, as described.

(5. The combination of the drier A with the hot-air duct H leading into it and with the hotair dischargepipe I leading from it, and fan J, with the branch pipe M, and dampers d 6, all arranged to allow part of the air to be drawn through the drier and part past the drier, as specified.

7. The hot-air duct H,combined with the differential pipes f g h, and with the apron chamber G, within which said pipes are contained, as described.

8. The apron G, placed around the coolerpipes E E of the kiln B, said apron being provided with a damper or door, i, in its upper part, as specified.

9. In the drier A, the inclined shelves in m, placed along the outer walls of said drier, as described.

10. The process herein described of preliminarily drying the char by conveying into it heated air from around the coolers of a kiln, as specified.

GEORGE M. NE\VHALL. AUGUSTUS \V. OOLXVELL. \Vitnesses:

H. B. BLAUVELT, HARRY M. TURK. 

